The world has been
annihilated and an evil bestial deity must be appeased.

Saki, a young girl trying to escape destiny, finds refuge in
an unusual and rough line of work. But she has been chosen for an unthinkable
role: a princess must be sacrificed to the monster Yamata-no-Orochi at the 50
year Tenken Festival.

Can Manaka, the man who is in love
with her, follow her into this abyss to save her from fate only to discover the
dark secret of the ceremony?